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XoLiMiT
join:2001-10-04
Englishtown, NJ

XoLiMiT

Member

DNS - Secondary DNS Zones - Defining DNS Name Servers Question

I have been having "mixed" feelings with regards to a DNS configuration scenario/consideration:

I have 2 "Top Level" DNS servers.

ns1.top.com - 10.10.10.10
ns2.top.com - 10.10.10.11

Within these Top Level DNS Servers i have "many" Secondary DNS Zones:

usa.top.com
canada.top.com
china.top.com
etc....

Since these are Secondary DNS Zones i have "Master" servers defined for each Secondary DNS Zone to pull from the Primary DNS Servers/SOAs

usa.top.com
ns1.usa.top.com - 10.20.10.10
ns2.usa.top.com - 10.20.10.11

canada.top.com
ns1.canada.top.com - 10.30.10.10
ns2.canada.top.com - 10.30.10.11

china.top.com
ns1.china.top.com - 10.40.10.10
ns2.china.top.com - 10.40.10.11

etc....

Within the usa.top.com DNS zone/servers i have the following "A" records which are also the "NS" records for the usa.top.com DNS Zone
ns1.usa.top.com - 10.20.10.10
ns2.usa.top.com - 10.20.10.11

The question/dilemma is do i need to add the top.com DNS Name Servers to the Name Servers tab of the usa.top.com Primary DNS Zone as follows in order to ensure proper DNS Zone Transfers from the Primary DNS Zone:

ns1.usa.top.com - 10.20.10.10
ns2.usa.top.com - 10.20.10.11
ns1.top.com - 10.10.10.10
ns2.top.com - 10.10.10.11

Zone Transfers were previously configured on ns1.usa.top.com and ns2.usa.top.com to allow transfer of the usa.top.com DNS Zone to the ns1.top.com and ns2.top.com top level DNS Servers WITHOUT adding ns1.top.com and ns2.top.com to the name servers tab,

The zone transfers are working properly and the DNS data is available and resolving. The question is do we need to add the ns1.top.com and ns2.top.com to the name servers list for the usa.top.com DNS Zone/Name servers in ADDITION to allowing DNS Zone transfers from a best practices perspective?

The 2nd question is if we define all 4 name servers for the usa.top.com DNS Zone:

ns1.usa.top.com - 10.20.10.10
ns2.usa.top.com - 10.20.10.11
ns1.top.com - 10.10.10.10
ns2.top.com - 10.10.10.11

Will this generate extra traffic on the network as clients within the usa.top.com network would randomly now be going accross the WAN to reach the top.com name servers in addition to the usa.top.com name servers?

If anyone can shed some light on this "dilemma" i would greatly appreciate it.